The beam energy measurement system at BEPCII is composed of there parts： laser source and optics system, laser-electron interaction system and High Purity Germanium （HPGe） detector system. The special components an...The beam energy measurement system at BEPCII is composed of there parts： laser source and optics system, laser-electron interaction system and High Purity Germanium （HPGe） detector system. The special components and construction of each part are introduced, especially about radiation background measurement in the storage ring, which is of great importance for the safe commissioning of HPGe detector.展开更多
The beam energy measurement system is of great importance for both BEPC-II accelerator and BES-III detector. The system is based on measuring the energies of Compton back-scattered photons. In order to meet the requir...The beam energy measurement system is of great importance for both BEPC-II accelerator and BES-III detector. The system is based on measuring the energies of Compton back-scattered photons. In order to meet the requirements of data taking and improve the measurement accuracy, the system has continued to be upgraded, which involves the updating of laser and optics subsystems, replacement of a view-port of the laser to the vacuum insertion subsystem, the use of an electric cooling system for a high purity germanium detector, and improvement of the data acquisition and processing subsystem. The upgrade system guarantees the smooth and efficient measurement of beam energy at BEPC-II and enables accurate offline energy values for further physics analysis at BES-III.展开更多
基金Supported by National Natural Science Foundation of China (10775412,10825524)Instrument Developing Project of the Chinese Academy of Sciences (YZ200713)+4 种基金Major State Basic Research Development Program (2009CB825203,2009CB825206)Knowledge Innovation Project of The Chinese Academy of Sciences (KJCX2-YW-N29)RFBR 08-02-00328-a,08-02-00251-a,08-02-92200-NSFC-aSB RAS joint project No.32 for fundamental researcher with CASthe Department of Energy under Contract No.DE-FG02-04ER41291 (U.Hawaii)
文摘The beam energy measurement system at BEPCII is composed of there parts： laser source and optics system, laser-electron interaction system and High Purity Germanium （HPGe） detector system. The special components and construction of each part are introduced, especially about radiation background measurement in the storage ring, which is of great importance for the safe commissioning of HPGe detector.
基金Supported in part by National Natural Science Foundation of China(NSFC)(11375206,10775142,10825524,11125525,11235011)the Ministry of Science and Technology of China(2015CB856700,2015CB856705)+3 种基金State key laboratory of particle and detection and electronics and the CAS Center for Excellence in Particle Physics(CCEPP)the RFBR grant(14-02-00129-a)U.S.Department of Energy(DE-FG02-04ER41291,DE-FG02-05ER41374,DE-FG02-94ER40823,DESC0010118)U.S.National Science Foundation,part of this work related to the design of Zn Se viewports is supported by the Russian Science Foundation(14-50-00080)
文摘The beam energy measurement system is of great importance for both BEPC-II accelerator and BES-III detector. The system is based on measuring the energies of Compton back-scattered photons. In order to meet the requirements of data taking and improve the measurement accuracy, the system has continued to be upgraded, which involves the updating of laser and optics subsystems, replacement of a view-port of the laser to the vacuum insertion subsystem, the use of an electric cooling system for a high purity germanium detector, and improvement of the data acquisition and processing subsystem. The upgrade system guarantees the smooth and efficient measurement of beam energy at BEPC-II and enables accurate offline energy values for further physics analysis at BES-III.
